SOLUTION: If you clean a fish tank in 30 mins, and your brother cleans it in 45 mins, how long will it take if you work together?

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Question 648142: If you clean a fish tank in 30 mins, and your brother cleans it in 45 mins, how long will it take if you work together?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
1/30 + 1/45 = 1/t

3t + 2t = 90 ... Multiply EVERY term by the LCD 90 to clear out the fractions.

5t = 90

t = 90/5

t = 18

So it will take 18 minutes if they work together.

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